Sectional water-tube boiler.



T. GOWEN.

SEGTIONAL WATER TUBE BOILER.

APPLICATION FILED NOV. 3, 1908.

Patented June 1,1909.

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T. GOWEN. SEUTIONAL WATER TUBE BOILER. APPLICATION FILED NOV. 3, 1908.

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UN 1T THOMAS GOWEN, OF SEATTLE, WASHINGTON.

SECTIONAL WATER-TUBE BOILER.

To all whom it may concern:

Be it known that I, THOMAS GowEN, a citizen of the United States of America, and a resident of the city of Seattle, in the county of King and State of v Vashington, have invented certain new and useful Improvements in Sectional Water-Tube Boilers, of which the following is a specification.

My invention has special reference to boilers of the above mentioned type and aims primarily to provide a construction which possesses advantages in simplici y, durability and general efficiency.

A further object resides in the provision of water tube sections of novel construction, supported so that they can be both easily re moved and inserted.

A further object is to provide water tube sections, the upper water tubes of which are constructed to receive Water in less volume than the lower tubes or those water tubes arranged nearer the fire.

it-h these main objects, and several minor objects, in view, which will be referred to as the description progresses, invention resides in the structural features, arrangements and combinations of parts hereinafter described and succinctly defined in my annexed claims.

Referring now to the accompanying drawings, in which like numerals of reference indicate like parts throughout: Figure l is a longitudinal sectional view of a boiler, in such form as now preferred by me. Fig. 2 is a front view thereof partly in elevation and partly in section with the casing removed. Fig. 3 is a detail view in section illustrating more particularly the arrangement of the couplings at the rear end portions of the water tubes of a boiler section. Fig. 4 is a fragmentary longitudinal view of one of the upper water tubes, and Fig. 5 is a fragmentary detail view illustrating one of the headers of a boiler section as having slid part way down its inclined seat, during the operation of removing the said boiler section.

Referring now to the drawings by nu merals of reference, 1 indicates the furnace grate, 2 the doorway through which the fuel is fed and 3 a mud drum which is supported on the front wall of the furnace over the said door way 2. While by this construction, mud drum 3 is arranged forwardly of grate 1, I prefer to further protect the same from the heat of the fire, by providing a suitable Specification of Letters Patent.

Application filed November 3, 1968.

Patented June 1, 1909.

Serial No. 460,936.

shield 5, arranged to practically isolate the mud drum. from the fire chamber.

Shield 5 as now considered, is composed of inner and outer sections (see Fig. 1) the outer of which is preferably formed of asbestos, fire-clay or other suitable refractory material.

Reference numeral 6 indicates a steam. drum, and 7 suitable down How pipes leading therefrom to mud drum 3.

Between down flow pipes 7 I. arrange and removably support a plurality of boiler sections, each comprising a header 8 and two rows of water tubes 9, the tubes of one row alternating with those of the other and said headers being formed to provide two chambers, as 8, S one of which communicates directly with mud drum 3 and the other with steam drum 6, (see Fig. 2). Yi'hile said headers may be otherwise formed to provide the chambers 8, 8 1 preferably provide them in the form of single hollow castings, each divided by a vertical invious partition 8, whereby communication between chambers 8, 8 is had only through the rows of water tubes 9, each of which communicates di rectly with a respective chamber and at their rear end portions being connected by couplings, as 10.

The vertical rows of couplings 10 form wall sections to prevent the heat working injury to the adjacent wall of the casing 16 and said couplings are preferably formed with shoulders 11 so as to engage one on another, as shown, thereby supporting the water tubes at their rear end portions and relieving them of strain at their points of connection with headers 8. The lowest coupling 10 of each vertical row can be en-- gaged on any suitable support, as for eX- ample, the wall 12.

To facilitate the proper positioning and removal of headers 8, the same are provided on their lower end portions with bearing parts 13 which I term shoes. These shoes are, formed by outwardly projecting circumferential flanges, set at an angle so as to be inclined upwardly in a rearward direction and are adapted to engage and ride on corresponding inclined seats provided by the outwardly projecting flanges 18 on the upper end portion of mud drum 3, toward and from their normal positions in which they are secured to said mud drum and to steam drum 6, as by bolts, as shown.

At their upper end portions, headers 8 are provided with extensions 14 having circumferential flanges which are inclined downwardly in a rearward direction and adapted to seat against correspondingly inclined seats on steam drum 6, provided by flanges 21 on the depending necks or extensions 22. The inclination of these upper seats obviously need not be great, but the inclination of the seats on mud drum 3 should preferably be comparatively abrupt, so that in removing a section, its header will slide over the same, being assisted by gravity, and in so doing its upper end portion will be disengaged from its seat, as illustrated in Fig. 6. During this operation the couplings 10 of the boiler section are slid off of support 12, and the boiler section is therefore capable of being easily and quickly lifted and removed through an opening 17 provided in the front wall of the casing. Opening 17 is normally closed by a suitable closure 18, which can be supported in any desired manner.

To obtain a more thorough and rapid vaporizing of the water in circulation I incline the rows of water tubes 9 downwardly from headers 8 and in one or more of the upper tubes of each row as found desirable, I provide cores 19, supported by spider arms 20, about which the water will be caused to travel in a comparatively thin or film like state. As now considered, the end portions of these cores 19 (see Fig. 4) are tapered to reduce to a minimum the resistance oflerer thereby to the Water in its passage, thereby preventing the possible formation of eddies.

Headers 8 and couplings 10 are both provided with hand holes 14, arranged so that there will be one directly opposite each end of each water tube, which hand holes may be closed in any desired manner, as for example by covers 15.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent of the United States, is:

1. A boiler including mud and vsteam drums arranged one above the other, said mud drums being provided with seats inclined downwardly in an outward direction, water tube sections coi'nprising headers and rows of water tubes, said headers being pro vided on their lower ends with inclined shoes engaged on the seats of said mud drum, and

means for supporting the rear end portions of said water tube section, said means being arranged entirely beneath the rows of water tubes so as to permit of tilting and sliding of said sections during sliding movement of the shoes of said headers on the seats of said mud drum.

2. A boiler including mud and steam drums arranged one above the other, suitable seats on the steam drum and downwardly and outwardly inclined seats on the mud drum, and water tube sections comprising headers and rows of water tubes, said sections being freely supported at their rear ends, said headers being provided on their upper and lower ends with suitable shoes engaging the seats of the drums so that the rear ends of the sections may be freely tilted as soon as the headers are disconnected from the seats.

3. A boiler including a casing provided in its front wall with an opening and provided adjacent thereto with upper and lower seats the lower of which are inclined downwardly in a forward direction, water tube sections comprising headers and rows of water tubes extending rearwardly in a downward direction, and means freely supporting said sections at their rear ends, said headers being provided on their upper and lower ends with suitable shoes engaging said seats of the boiler so that the rear ends of the sections may be freely tilted as soon as the headers are disconnected from the seats.

4. In a water tube boiler, a mud drum, a steam drum, return pipes connecting said drums near the ends thereof, headers connecting said drums between the return pipes and having rearwardly extending tubes connected in pairs, a furnace wall or casing, and a shield connected with said furnace wall and extending rearwardly and upwardly adjacent the mud drum and the lower end of the headers, said shield being composed of inner and outer sections, the outer of which is formed of refractory material.

Signed at Seattle, Washington, this 27th day of October, 1908.

THOMAS GOVVEN.

Witnesses STEPHEN A. BROOKS. ARL'ITA ADAMS. 

